1 /* 2 * ALSA sequencer Client Manager 3 * Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl> 4 * Jaroslav Kysela <perex@suse.cz> 5 * Takashi Iwai <tiwai@suse.de> 6 * 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 * 22 */ 23 24 #include <sound/driver.h> 25 #include <linux/init.h> 26 #include <linux/smp_lock.h> 27 #include <linux/slab.h> 28 #include <sound/core.h> 29 #include <sound/minors.h> 30 #include <linux/kmod.h> 31 32 #include <sound/seq_kernel.h> 33 #include "seq_clientmgr.h" 34 #include "seq_memory.h" 35 #include "seq_queue.h" 36 #include "seq_timer.h" 37 #include "seq_info.h" 38 #include "seq_system.h" 39 #include <sound/seq_device.h> 40 #ifdef CONFIG_COMPAT 41 #include <linux/compat.h> 42 #endif 43 44 /* Client Manager 45 46 * this module handles the connections of userland and kernel clients 47 * 48 */ 49 50 #define SNDRV_SEQ_LFLG_INPUT 0x0001 51 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002 52 #define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT) 53 54 static DEFINE_SPINLOCK(clients_lock); 55 static DECLARE_MUTEX(register_mutex); 56 57 /* 58 * client table 59 */ 60 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS]; 61 static client_t *clienttab[SNDRV_SEQ_MAX_CLIENTS]; 62 static usage_t client_usage; 63 64 /* 65 * prototypes 66 */ 67 static int bounce_error_event(client_t *client, snd_seq_event_t *event, int err, int atomic, int hop); 68 static int snd_seq_deliver_single_event(client_t *client, snd_seq_event_t *event, int filter, int atomic, int hop); 69 70 /* 71 */ 72 73 static inline mm_segment_t snd_enter_user(void) 74 { 75 mm_segment_t fs = get_fs(); 76 set_fs(get_ds()); 77 return fs; 78 } 79 80 static inline void snd_leave_user(mm_segment_t fs) 81 { 82 set_fs(fs); 83 } 84 85 /* 86 */ 87 static inline unsigned short snd_seq_file_flags(struct file *file) 88 { 89 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) { 90 case FMODE_WRITE: 91 return SNDRV_SEQ_LFLG_OUTPUT; 92 case FMODE_READ: 93 return SNDRV_SEQ_LFLG_INPUT; 94 default: 95 return SNDRV_SEQ_LFLG_OPEN; 96 } 97 } 98 99 static inline int snd_seq_write_pool_allocated(client_t *client) 100 { 101 return snd_seq_total_cells(client->pool) > 0; 102 } 103 104 /* return pointer to client structure for specified id */ 105 static client_t *clientptr(int clientid) 106 { 107 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { 108 snd_printd("Seq: oops. Trying to get pointer to client %d\n", clientid); 109 return NULL; 110 } 111 return clienttab[clientid]; 112 } 113 114 extern int seq_client_load[]; 115 116 client_t *snd_seq_client_use_ptr(int clientid) 117 { 118 unsigned long flags; 119 client_t *client; 120 121 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { 122 snd_printd("Seq: oops. Trying to get pointer to client %d\n", clientid); 123 return NULL; 124 } 125 spin_lock_irqsave(&clients_lock, flags); 126 client = clientptr(clientid); 127 if (client) 128 goto __lock; 129 if (clienttablock[clientid]) { 130 spin_unlock_irqrestore(&clients_lock, flags); 131 return NULL; 132 } 133 spin_unlock_irqrestore(&clients_lock, flags); 134 #ifdef CONFIG_KMOD 135 if (!in_interrupt() && current->fs->root) { 136 static char client_requested[64]; 137 static char card_requested[SNDRV_CARDS]; 138 if (clientid < 64) { 139 int idx; 140 141 if (! client_requested[clientid] && current->fs->root) { 142 client_requested[clientid] = 1; 143 for (idx = 0; idx < 64; idx++) { 144 if (seq_client_load[idx] < 0) 145 break; 146 if (seq_client_load[idx] == clientid) { 147 request_module("snd-seq-client-%i", clientid); 148 break; 149 } 150 } 151 } 152 } else if (clientid >= 64 && clientid < 128) { 153 int card = (clientid - 64) / 8; 154 if (card < snd_ecards_limit) { 155 if (! card_requested[card]) { 156 card_requested[card] = 1; 157 snd_request_card(card); 158 } 159 snd_seq_device_load_drivers(); 160 } 161 } 162 spin_lock_irqsave(&clients_lock, flags); 163 client = clientptr(clientid); 164 if (client) 165 goto __lock; 166 spin_unlock_irqrestore(&clients_lock, flags); 167 } 168 #endif 169 return NULL; 170 171 __lock: 172 snd_use_lock_use(&client->use_lock); 173 spin_unlock_irqrestore(&clients_lock, flags); 174 return client; 175 } 176 177 static void usage_alloc(usage_t * res, int num) 178 { 179 res->cur += num; 180 if (res->cur > res->peak) 181 res->peak = res->cur; 182 } 183 184 static void usage_free(usage_t * res, int num) 185 { 186 res->cur -= num; 187 } 188 189 /* initialise data structures */ 190 int __init client_init_data(void) 191 { 192 /* zap out the client table */ 193 memset(&clienttablock, 0, sizeof(clienttablock)); 194 memset(&clienttab, 0, sizeof(clienttab)); 195 return 0; 196 } 197 198 199 static client_t *seq_create_client1(int client_index, int poolsize) 200 { 201 unsigned long flags; 202 int c; 203 client_t *client; 204 205 /* init client data */ 206 client = kzalloc(sizeof(*client), GFP_KERNEL); 207 if (client == NULL) 208 return NULL; 209 client->pool = snd_seq_pool_new(poolsize); 210 if (client->pool == NULL) { 211 kfree(client); 212 return NULL; 213 } 214 client->type = NO_CLIENT; 215 snd_use_lock_init(&client->use_lock); 216 rwlock_init(&client->ports_lock); 217 init_MUTEX(&client->ports_mutex); 218 INIT_LIST_HEAD(&client->ports_list_head); 219 220 /* find free slot in the client table */ 221 spin_lock_irqsave(&clients_lock, flags); 222 if (client_index < 0) { 223 for (c = 128; c < SNDRV_SEQ_MAX_CLIENTS; c++) { 224 if (clienttab[c] || clienttablock[c]) 225 continue; 226 clienttab[client->number = c] = client; 227 spin_unlock_irqrestore(&clients_lock, flags); 228 return client; 229 } 230 } else { 231 if (clienttab[client_index] == NULL && !clienttablock[client_index]) { 232 clienttab[client->number = client_index] = client; 233 spin_unlock_irqrestore(&clients_lock, flags); 234 return client; 235 } 236 } 237 spin_unlock_irqrestore(&clients_lock, flags); 238 snd_seq_pool_delete(&client->pool); 239 kfree(client); 240 return NULL; /* no free slot found or busy, return failure code */ 241 } 242 243 244 static int seq_free_client1(client_t *client) 245 { 246 unsigned long flags; 247 248 snd_assert(client != NULL, return -EINVAL); 249 snd_seq_delete_all_ports(client); 250 snd_seq_queue_client_leave(client->number); 251 spin_lock_irqsave(&clients_lock, flags); 252 clienttablock[client->number] = 1; 253 clienttab[client->number] = NULL; 254 spin_unlock_irqrestore(&clients_lock, flags); 255 snd_use_lock_sync(&client->use_lock); 256 snd_seq_queue_client_termination(client->number); 257 if (client->pool) 258 snd_seq_pool_delete(&client->pool); 259 spin_lock_irqsave(&clients_lock, flags); 260 clienttablock[client->number] = 0; 261 spin_unlock_irqrestore(&clients_lock, flags); 262 return 0; 263 } 264 265 266 static void seq_free_client(client_t * client) 267 { 268 down(®ister_mutex); 269 switch (client->type) { 270 case NO_CLIENT: 271 snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n", client->number); 272 break; 273 case USER_CLIENT: 274 case KERNEL_CLIENT: 275 seq_free_client1(client); 276 usage_free(&client_usage, 1); 277 break; 278 279 default: 280 snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n", client->number, client->type); 281 } 282 up(®ister_mutex); 283 284 snd_seq_system_client_ev_client_exit(client->number); 285 } 286 287 288 289 /* -------------------------------------------------------- */ 290 291 /* create a user client */ 292 static int snd_seq_open(struct inode *inode, struct file *file) 293 { 294 int c, mode; /* client id */ 295 client_t *client; 296 user_client_t *user; 297 298 if (down_interruptible(®ister_mutex)) 299 return -ERESTARTSYS; 300 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS); 301 if (client == NULL) { 302 up(®ister_mutex); 303 return -ENOMEM; /* failure code */ 304 } 305 306 mode = snd_seq_file_flags(file); 307 if (mode & SNDRV_SEQ_LFLG_INPUT) 308 client->accept_input = 1; 309 if (mode & SNDRV_SEQ_LFLG_OUTPUT) 310 client->accept_output = 1; 311 312 user = &client->data.user; 313 user->fifo = NULL; 314 user->fifo_pool_size = 0; 315 316 if (mode & SNDRV_SEQ_LFLG_INPUT) { 317 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS; 318 user->fifo = snd_seq_fifo_new(user->fifo_pool_size); 319 if (user->fifo == NULL) { 320 seq_free_client1(client); 321 kfree(client); 322 up(®ister_mutex); 323 return -ENOMEM; 324 } 325 } 326 327 usage_alloc(&client_usage, 1); 328 client->type = USER_CLIENT; 329 up(®ister_mutex); 330 331 c = client->number; 332 file->private_data = client; 333 334 /* fill client data */ 335 user->file = file; 336 sprintf(client->name, "Client-%d", c); 337 338 /* make others aware this new client */ 339 snd_seq_system_client_ev_client_start(c); 340 341 return 0; 342 } 343 344 /* delete a user client */ 345 static int snd_seq_release(struct inode *inode, struct file *file) 346 { 347 client_t *client = (client_t *) file->private_data; 348 349 if (client) { 350 seq_free_client(client); 351 if (client->data.user.fifo) 352 snd_seq_fifo_delete(&client->data.user.fifo); 353 kfree(client); 354 } 355 356 return 0; 357 } 358 359 360 /* handle client read() */ 361 /* possible error values: 362 * -ENXIO invalid client or file open mode 363 * -ENOSPC FIFO overflow (the flag is cleared after this error report) 364 * -EINVAL no enough user-space buffer to write the whole event 365 * -EFAULT seg. fault during copy to user space 366 */ 367 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count, loff_t *offset) 368 { 369 client_t *client = (client_t *) file->private_data; 370 fifo_t *fifo; 371 int err; 372 long result = 0; 373 snd_seq_event_cell_t *cell; 374 375 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT)) 376 return -ENXIO; 377 378 if (!access_ok(VERIFY_WRITE, buf, count)) 379 return -EFAULT; 380 381 /* check client structures are in place */ 382 snd_assert(client != NULL, return -ENXIO); 383 384 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL) 385 return -ENXIO; 386 387 if (atomic_read(&fifo->overflow) > 0) { 388 /* buffer overflow is detected */ 389 snd_seq_fifo_clear(fifo); 390 /* return error code */ 391 return -ENOSPC; 392 } 393 394 cell = NULL; 395 err = 0; 396 snd_seq_fifo_lock(fifo); 397 398 /* while data available in queue */ 399 while (count >= sizeof(snd_seq_event_t)) { 400 int nonblock; 401 402 nonblock = (file->f_flags & O_NONBLOCK) || result > 0; 403 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) { 404 break; 405 } 406 if (snd_seq_ev_is_variable(&cell->event)) { 407 snd_seq_event_t tmpev; 408 tmpev = cell->event; 409 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK; 410 if (copy_to_user(buf, &tmpev, sizeof(snd_seq_event_t))) { 411 err = -EFAULT; 412 break; 413 } 414 count -= sizeof(snd_seq_event_t); 415 buf += sizeof(snd_seq_event_t); 416 err = snd_seq_expand_var_event(&cell->event, count, 417 (char __force *)buf, 0, 418 sizeof(snd_seq_event_t)); 419 if (err < 0) 420 break; 421 result += err; 422 count -= err; 423 buf += err; 424 } else { 425 if (copy_to_user(buf, &cell->event, sizeof(snd_seq_event_t))) { 426 err = -EFAULT; 427 break; 428 } 429 count -= sizeof(snd_seq_event_t); 430 buf += sizeof(snd_seq_event_t); 431 } 432 snd_seq_cell_free(cell); 433 cell = NULL; /* to be sure */ 434 result += sizeof(snd_seq_event_t); 435 } 436 437 if (err < 0) { 438 if (cell) 439 snd_seq_fifo_cell_putback(fifo, cell); 440 if (err == -EAGAIN && result > 0) 441 err = 0; 442 } 443 snd_seq_fifo_unlock(fifo); 444 445 return (err < 0) ? err : result; 446 } 447 448 449 /* 450 * check access permission to the port 451 */ 452 static int check_port_perm(client_port_t *port, unsigned int flags) 453 { 454 if ((port->capability & flags) != flags) 455 return 0; 456 return flags; 457 } 458 459 /* 460 * check if the destination client is available, and return the pointer 461 * if filter is non-zero, client filter bitmap is tested. 462 */ 463 static client_t *get_event_dest_client(snd_seq_event_t *event, int filter) 464 { 465 client_t *dest; 466 467 dest = snd_seq_client_use_ptr(event->dest.client); 468 if (dest == NULL) 469 return NULL; 470 if (! dest->accept_input) 471 goto __not_avail; 472 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) && 473 ! test_bit(event->type, dest->event_filter)) 474 goto __not_avail; 475 if (filter && !(dest->filter & filter)) 476 goto __not_avail; 477 478 return dest; /* ok - accessible */ 479 __not_avail: 480 snd_seq_client_unlock(dest); 481 return NULL; 482 } 483 484 485 /* 486 * Return the error event. 487 * 488 * If the receiver client is a user client, the original event is 489 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If 490 * the original event is also variable length, the external data is 491 * copied after the event record. 492 * If the receiver client is a kernel client, the original event is 493 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra 494 * kmalloc. 495 */ 496 static int bounce_error_event(client_t *client, snd_seq_event_t *event, 497 int err, int atomic, int hop) 498 { 499 snd_seq_event_t bounce_ev; 500 int result; 501 502 if (client == NULL || 503 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) || 504 ! client->accept_input) 505 return 0; /* ignored */ 506 507 /* set up quoted error */ 508 memset(&bounce_ev, 0, sizeof(bounce_ev)); 509 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR; 510 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED; 511 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT; 512 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM; 513 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE; 514 bounce_ev.dest.client = client->number; 515 bounce_ev.dest.port = event->source.port; 516 bounce_ev.data.quote.origin = event->dest; 517 bounce_ev.data.quote.event = event; 518 bounce_ev.data.quote.value = -err; /* use positive value */ 519 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1); 520 if (result < 0) { 521 client->event_lost++; 522 return result; 523 } 524 525 return result; 526 } 527 528 529 /* 530 * rewrite the time-stamp of the event record with the curren time 531 * of the given queue. 532 * return non-zero if updated. 533 */ 534 static int update_timestamp_of_queue(snd_seq_event_t *event, int queue, int real_time) 535 { 536 queue_t *q; 537 538 q = queueptr(queue); 539 if (! q) 540 return 0; 541 event->queue = queue; 542 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK; 543 if (real_time) { 544 event->time.time = snd_seq_timer_get_cur_time(q->timer); 545 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL; 546 } else { 547 event->time.tick = snd_seq_timer_get_cur_tick(q->timer); 548 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK; 549 } 550 queuefree(q); 551 return 1; 552 } 553 554 555 /* 556 * deliver an event to the specified destination. 557 * if filter is non-zero, client filter bitmap is tested. 558 * 559 * RETURN VALUE: 0 : if succeeded 560 * <0 : error 561 */ 562 static int snd_seq_deliver_single_event(client_t *client, 563 snd_seq_event_t *event, 564 int filter, int atomic, int hop) 565 { 566 client_t *dest = NULL; 567 client_port_t *dest_port = NULL; 568 int result = -ENOENT; 569 int direct; 570 571 direct = snd_seq_ev_is_direct(event); 572 573 dest = get_event_dest_client(event, filter); 574 if (dest == NULL) 575 goto __skip; 576 dest_port = snd_seq_port_use_ptr(dest, event->dest.port); 577 if (dest_port == NULL) 578 goto __skip; 579 580 /* check permission */ 581 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) { 582 result = -EPERM; 583 goto __skip; 584 } 585 586 if (dest_port->timestamping) 587 update_timestamp_of_queue(event, dest_port->time_queue, 588 dest_port->time_real); 589 590 switch (dest->type) { 591 case USER_CLIENT: 592 if (dest->data.user.fifo) 593 result = snd_seq_fifo_event_in(dest->data.user.fifo, event); 594 break; 595 596 case KERNEL_CLIENT: 597 if (dest_port->event_input == NULL) 598 break; 599 result = dest_port->event_input(event, direct, dest_port->private_data, atomic, hop); 600 break; 601 default: 602 break; 603 } 604 605 __skip: 606 if (dest_port) 607 snd_seq_port_unlock(dest_port); 608 if (dest) 609 snd_seq_client_unlock(dest); 610 611 if (result < 0 && !direct) { 612 result = bounce_error_event(client, event, result, atomic, hop); 613 } 614 return result; 615 } 616 617 618 /* 619 * send the event to all subscribers: 620 */ 621 static int deliver_to_subscribers(client_t *client, 622 snd_seq_event_t *event, 623 int atomic, int hop) 624 { 625 subscribers_t *subs; 626 int err = 0, num_ev = 0; 627 snd_seq_event_t event_saved; 628 client_port_t *src_port; 629 struct list_head *p; 630 port_subs_info_t *grp; 631 632 src_port = snd_seq_port_use_ptr(client, event->source.port); 633 if (src_port == NULL) 634 return -EINVAL; /* invalid source port */ 635 /* save original event record */ 636 event_saved = *event; 637 grp = &src_port->c_src; 638 639 /* lock list */ 640 if (atomic) 641 read_lock(&grp->list_lock); 642 else 643 down_read(&grp->list_mutex); 644 list_for_each(p, &grp->list_head) { 645 subs = list_entry(p, subscribers_t, src_list); 646 event->dest = subs->info.dest; 647 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 648 /* convert time according to flag with subscription */ 649 update_timestamp_of_queue(event, subs->info.queue, 650 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL); 651 err = snd_seq_deliver_single_event(client, event, 652 0, atomic, hop); 653 if (err < 0) 654 break; 655 num_ev++; 656 /* restore original event record */ 657 *event = event_saved; 658 } 659 if (atomic) 660 read_unlock(&grp->list_lock); 661 else 662 up_read(&grp->list_mutex); 663 *event = event_saved; /* restore */ 664 snd_seq_port_unlock(src_port); 665 return (err < 0) ? err : num_ev; 666 } 667 668 669 #ifdef SUPPORT_BROADCAST 670 /* 671 * broadcast to all ports: 672 */ 673 static int port_broadcast_event(client_t *client, 674 snd_seq_event_t *event, 675 int atomic, int hop) 676 { 677 int num_ev = 0, err = 0; 678 client_t *dest_client; 679 struct list_head *p; 680 681 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST); 682 if (dest_client == NULL) 683 return 0; /* no matching destination */ 684 685 read_lock(&dest_client->ports_lock); 686 list_for_each(p, &dest_client->ports_list_head) { 687 client_port_t *port = list_entry(p, client_port_t, list); 688 event->dest.port = port->addr.port; 689 /* pass NULL as source client to avoid error bounce */ 690 err = snd_seq_deliver_single_event(NULL, event, 691 SNDRV_SEQ_FILTER_BROADCAST, 692 atomic, hop); 693 if (err < 0) 694 break; 695 num_ev++; 696 } 697 read_unlock(&dest_client->ports_lock); 698 snd_seq_client_unlock(dest_client); 699 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */ 700 return (err < 0) ? err : num_ev; 701 } 702 703 /* 704 * send the event to all clients: 705 * if destination port is also ADDRESS_BROADCAST, deliver to all ports. 706 */ 707 static int broadcast_event(client_t *client, 708 snd_seq_event_t *event, int atomic, int hop) 709 { 710 int err = 0, num_ev = 0; 711 int dest; 712 snd_seq_addr_t addr; 713 714 addr = event->dest; /* save */ 715 716 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) { 717 /* don't send to itself */ 718 if (dest == client->number) 719 continue; 720 event->dest.client = dest; 721 event->dest.port = addr.port; 722 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST) 723 err = port_broadcast_event(client, event, atomic, hop); 724 else 725 /* pass NULL as source client to avoid error bounce */ 726 err = snd_seq_deliver_single_event(NULL, event, 727 SNDRV_SEQ_FILTER_BROADCAST, 728 atomic, hop); 729 if (err < 0) 730 break; 731 num_ev += err; 732 } 733 event->dest = addr; /* restore */ 734 return (err < 0) ? err : num_ev; 735 } 736 737 738 /* multicast - not supported yet */ 739 static int multicast_event(client_t *client, snd_seq_event_t *event, 740 int atomic, int hop) 741 { 742 snd_printd("seq: multicast not supported yet.\n"); 743 return 0; /* ignored */ 744 } 745 #endif /* SUPPORT_BROADCAST */ 746 747 748 /* deliver an event to the destination port(s). 749 * if the event is to subscribers or broadcast, the event is dispatched 750 * to multiple targets. 751 * 752 * RETURN VALUE: n > 0 : the number of delivered events. 753 * n == 0 : the event was not passed to any client. 754 * n < 0 : error - event was not processed. 755 */ 756 static int snd_seq_deliver_event(client_t *client, snd_seq_event_t *event, 757 int atomic, int hop) 758 { 759 int result; 760 761 hop++; 762 if (hop >= SNDRV_SEQ_MAX_HOPS) { 763 snd_printd("too long delivery path (%d:%d->%d:%d)\n", 764 event->source.client, event->source.port, 765 event->dest.client, event->dest.port); 766 return -EMLINK; 767 } 768 769 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS || 770 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) 771 result = deliver_to_subscribers(client, event, atomic, hop); 772 #ifdef SUPPORT_BROADCAST 773 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST || 774 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST) 775 result = broadcast_event(client, event, atomic, hop); 776 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS) 777 result = multicast_event(client, event, atomic, hop); 778 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST) 779 result = port_broadcast_event(client, event, atomic, hop); 780 #endif 781 else 782 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop); 783 784 return result; 785 } 786 787 /* 788 * dispatch an event cell: 789 * This function is called only from queue check routines in timer 790 * interrupts or after enqueued. 791 * The event cell shall be released or re-queued in this function. 792 * 793 * RETURN VALUE: n > 0 : the number of delivered events. 794 * n == 0 : the event was not passed to any client. 795 * n < 0 : error - event was not processed. 796 */ 797 int snd_seq_dispatch_event(snd_seq_event_cell_t *cell, int atomic, int hop) 798 { 799 client_t *client; 800 int result; 801 802 snd_assert(cell != NULL, return -EINVAL); 803 804 client = snd_seq_client_use_ptr(cell->event.source.client); 805 if (client == NULL) { 806 snd_seq_cell_free(cell); /* release this cell */ 807 return -EINVAL; 808 } 809 810 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) { 811 /* NOTE event: 812 * the event cell is re-used as a NOTE-OFF event and 813 * enqueued again. 814 */ 815 snd_seq_event_t tmpev, *ev; 816 817 /* reserve this event to enqueue note-off later */ 818 tmpev = cell->event; 819 tmpev.type = SNDRV_SEQ_EVENT_NOTEON; 820 result = snd_seq_deliver_event(client, &tmpev, atomic, hop); 821 822 /* 823 * This was originally a note event. We now re-use the 824 * cell for the note-off event. 825 */ 826 827 ev = &cell->event; 828 ev->type = SNDRV_SEQ_EVENT_NOTEOFF; 829 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH; 830 831 /* add the duration time */ 832 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) { 833 case SNDRV_SEQ_TIME_STAMP_TICK: 834 ev->time.tick += ev->data.note.duration; 835 break; 836 case SNDRV_SEQ_TIME_STAMP_REAL: 837 /* unit for duration is ms */ 838 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000); 839 ev->time.time.tv_sec += ev->data.note.duration / 1000 + 840 ev->time.time.tv_nsec / 1000000000; 841 ev->time.time.tv_nsec %= 1000000000; 842 break; 843 } 844 ev->data.note.velocity = ev->data.note.off_velocity; 845 846 /* Now queue this cell as the note off event */ 847 if (snd_seq_enqueue_event(cell, atomic, hop) < 0) 848 snd_seq_cell_free(cell); /* release this cell */ 849 850 } else { 851 /* Normal events: 852 * event cell is freed after processing the event 853 */ 854 855 result = snd_seq_deliver_event(client, &cell->event, atomic, hop); 856 snd_seq_cell_free(cell); 857 } 858 859 snd_seq_client_unlock(client); 860 return result; 861 } 862 863 864 /* Allocate a cell from client pool and enqueue it to queue: 865 * if pool is empty and blocking is TRUE, sleep until a new cell is 866 * available. 867 */ 868 static int snd_seq_client_enqueue_event(client_t *client, 869 snd_seq_event_t *event, 870 struct file *file, int blocking, 871 int atomic, int hop) 872 { 873 snd_seq_event_cell_t *cell; 874 int err; 875 876 /* special queue values - force direct passing */ 877 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 878 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS; 879 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 880 } else 881 #ifdef SUPPORT_BROADCAST 882 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) { 883 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST; 884 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 885 } 886 #endif 887 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 888 /* check presence of source port */ 889 client_port_t *src_port = snd_seq_port_use_ptr(client, event->source.port); 890 if (src_port == NULL) 891 return -EINVAL; 892 snd_seq_port_unlock(src_port); 893 } 894 895 /* direct event processing without enqueued */ 896 if (snd_seq_ev_is_direct(event)) { 897 if (event->type == SNDRV_SEQ_EVENT_NOTE) 898 return -EINVAL; /* this event must be enqueued! */ 899 return snd_seq_deliver_event(client, event, atomic, hop); 900 } 901 902 /* Not direct, normal queuing */ 903 if (snd_seq_queue_is_used(event->queue, client->number) <= 0) 904 return -EINVAL; /* invalid queue */ 905 if (! snd_seq_write_pool_allocated(client)) 906 return -ENXIO; /* queue is not allocated */ 907 908 /* allocate an event cell */ 909 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file); 910 if (err < 0) 911 return err; 912 913 /* we got a cell. enqueue it. */ 914 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) { 915 snd_seq_cell_free(cell); 916 return err; 917 } 918 919 return 0; 920 } 921 922 923 /* 924 * check validity of event type and data length. 925 * return non-zero if invalid. 926 */ 927 static int check_event_type_and_length(snd_seq_event_t *ev) 928 { 929 switch (snd_seq_ev_length_type(ev)) { 930 case SNDRV_SEQ_EVENT_LENGTH_FIXED: 931 if (snd_seq_ev_is_variable_type(ev)) 932 return -EINVAL; 933 break; 934 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE: 935 if (! snd_seq_ev_is_variable_type(ev) || 936 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN) 937 return -EINVAL; 938 break; 939 case SNDRV_SEQ_EVENT_LENGTH_VARUSR: 940 if (! snd_seq_ev_is_instr_type(ev) || 941 ! snd_seq_ev_is_direct(ev)) 942 return -EINVAL; 943 break; 944 } 945 return 0; 946 } 947 948 949 /* handle write() */ 950 /* possible error values: 951 * -ENXIO invalid client or file open mode 952 * -ENOMEM malloc failed 953 * -EFAULT seg. fault during copy from user space 954 * -EINVAL invalid event 955 * -EAGAIN no space in output pool 956 * -EINTR interrupts while sleep 957 * -EMLINK too many hops 958 * others depends on return value from driver callback 959 */ 960 static ssize_t snd_seq_write(struct file *file, const char __user *buf, size_t count, loff_t *offset) 961 { 962 client_t *client = (client_t *) file->private_data; 963 int written = 0, len; 964 int err = -EINVAL; 965 snd_seq_event_t event; 966 967 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT)) 968 return -ENXIO; 969 970 /* check client structures are in place */ 971 snd_assert(client != NULL, return -ENXIO); 972 973 if (!client->accept_output || client->pool == NULL) 974 return -ENXIO; 975 976 /* allocate the pool now if the pool is not allocated yet */ 977 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) { 978 if (snd_seq_pool_init(client->pool) < 0) 979 return -ENOMEM; 980 } 981 982 /* only process whole events */ 983 while (count >= sizeof(snd_seq_event_t)) { 984 /* Read in the event header from the user */ 985 len = sizeof(event); 986 if (copy_from_user(&event, buf, len)) { 987 err = -EFAULT; 988 break; 989 } 990 event.source.client = client->number; /* fill in client number */ 991 /* Check for extension data length */ 992 if (check_event_type_and_length(&event)) { 993 err = -EINVAL; 994 break; 995 } 996 997 /* check for special events */ 998 if (event.type == SNDRV_SEQ_EVENT_NONE) 999 goto __skip_event; 1000 else if (snd_seq_ev_is_reserved(&event)) { 1001 err = -EINVAL; 1002 break; 1003 } 1004 1005 if (snd_seq_ev_is_variable(&event)) { 1006 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK; 1007 if ((size_t)(extlen + len) > count) { 1008 /* back out, will get an error this time or next */ 1009 err = -EINVAL; 1010 break; 1011 } 1012 /* set user space pointer */ 1013 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR; 1014 event.data.ext.ptr = (char __force *)buf 1015 + sizeof(snd_seq_event_t); 1016 len += extlen; /* increment data length */ 1017 } else { 1018 #ifdef CONFIG_COMPAT 1019 if (client->convert32 && snd_seq_ev_is_varusr(&event)) { 1020 void *ptr = compat_ptr(event.data.raw32.d[1]); 1021 event.data.ext.ptr = ptr; 1022 } 1023 #endif 1024 } 1025 1026 /* ok, enqueue it */ 1027 err = snd_seq_client_enqueue_event(client, &event, file, 1028 !(file->f_flags & O_NONBLOCK), 1029 0, 0); 1030 if (err < 0) 1031 break; 1032 1033 __skip_event: 1034 /* Update pointers and counts */ 1035 count -= len; 1036 buf += len; 1037 written += len; 1038 } 1039 1040 return written ? written : err; 1041 } 1042 1043 1044 /* 1045 * handle polling 1046 */ 1047 static unsigned int snd_seq_poll(struct file *file, poll_table * wait) 1048 { 1049 client_t *client = (client_t *) file->private_data; 1050 unsigned int mask = 0; 1051 1052 /* check client structures are in place */ 1053 snd_assert(client != NULL, return -ENXIO); 1054 1055 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) && 1056 client->data.user.fifo) { 1057 1058 /* check if data is available in the outqueue */ 1059 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait)) 1060 mask |= POLLIN | POLLRDNORM; 1061 } 1062 1063 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) { 1064 1065 /* check if data is available in the pool */ 1066 if (!snd_seq_write_pool_allocated(client) || 1067 snd_seq_pool_poll_wait(client->pool, file, wait)) 1068 mask |= POLLOUT | POLLWRNORM; 1069 } 1070 1071 return mask; 1072 } 1073 1074 1075 /*-----------------------------------------------------*/ 1076 1077 1078 /* SYSTEM_INFO ioctl() */ 1079 static int snd_seq_ioctl_system_info(client_t *client, void __user *arg) 1080 { 1081 snd_seq_system_info_t info; 1082 1083 memset(&info, 0, sizeof(info)); 1084 /* fill the info fields */ 1085 info.queues = SNDRV_SEQ_MAX_QUEUES; 1086 info.clients = SNDRV_SEQ_MAX_CLIENTS; 1087 info.ports = 256; /* fixed limit */ 1088 info.channels = 256; /* fixed limit */ 1089 info.cur_clients = client_usage.cur; 1090 info.cur_queues = snd_seq_queue_get_cur_queues(); 1091 1092 if (copy_to_user(arg, &info, sizeof(info))) 1093 return -EFAULT; 1094 return 0; 1095 } 1096 1097 1098 /* RUNNING_MODE ioctl() */ 1099 static int snd_seq_ioctl_running_mode(client_t *client, void __user *arg) 1100 { 1101 struct sndrv_seq_running_info info; 1102 client_t *cptr; 1103 int err = 0; 1104 1105 if (copy_from_user(&info, arg, sizeof(info))) 1106 return -EFAULT; 1107 1108 /* requested client number */ 1109 cptr = snd_seq_client_use_ptr(info.client); 1110 if (cptr == NULL) 1111 return -ENOENT; /* don't change !!! */ 1112 1113 #ifdef SNDRV_BIG_ENDIAN 1114 if (! info.big_endian) { 1115 err = -EINVAL; 1116 goto __err; 1117 } 1118 #else 1119 if (info.big_endian) { 1120 err = -EINVAL; 1121 goto __err; 1122 } 1123 1124 #endif 1125 if (info.cpu_mode > sizeof(long)) { 1126 err = -EINVAL; 1127 goto __err; 1128 } 1129 cptr->convert32 = (info.cpu_mode < sizeof(long)); 1130 __err: 1131 snd_seq_client_unlock(cptr); 1132 return err; 1133 } 1134 1135 /* CLIENT_INFO ioctl() */ 1136 static void get_client_info(client_t *cptr, snd_seq_client_info_t *info) 1137 { 1138 info->client = cptr->number; 1139 1140 /* fill the info fields */ 1141 info->type = cptr->type; 1142 strcpy(info->name, cptr->name); 1143 info->filter = cptr->filter; 1144 info->event_lost = cptr->event_lost; 1145 memcpy(info->event_filter, cptr->event_filter, 32); 1146 info->num_ports = cptr->num_ports; 1147 memset(info->reserved, 0, sizeof(info->reserved)); 1148 } 1149 1150 static int snd_seq_ioctl_get_client_info(client_t * client, void __user *arg) 1151 { 1152 client_t *cptr; 1153 snd_seq_client_info_t client_info; 1154 1155 if (copy_from_user(&client_info, arg, sizeof(client_info))) 1156 return -EFAULT; 1157 1158 /* requested client number */ 1159 cptr = snd_seq_client_use_ptr(client_info.client); 1160 if (cptr == NULL) 1161 return -ENOENT; /* don't change !!! */ 1162 1163 get_client_info(cptr, &client_info); 1164 snd_seq_client_unlock(cptr); 1165 1166 if (copy_to_user(arg, &client_info, sizeof(client_info))) 1167 return -EFAULT; 1168 return 0; 1169 } 1170 1171 1172 /* CLIENT_INFO ioctl() */ 1173 static int snd_seq_ioctl_set_client_info(client_t * client, void __user *arg) 1174 { 1175 snd_seq_client_info_t client_info; 1176 1177 if (copy_from_user(&client_info, arg, sizeof(client_info))) 1178 return -EFAULT; 1179 1180 /* it is not allowed to set the info fields for an another client */ 1181 if (client->number != client_info.client) 1182 return -EPERM; 1183 /* also client type must be set now */ 1184 if (client->type != client_info.type) 1185 return -EINVAL; 1186 1187 /* fill the info fields */ 1188 if (client_info.name[0]) 1189 strlcpy(client->name, client_info.name, sizeof(client->name)); 1190 1191 client->filter = client_info.filter; 1192 client->event_lost = client_info.event_lost; 1193 memcpy(client->event_filter, client_info.event_filter, 32); 1194 1195 return 0; 1196 } 1197 1198 1199 /* 1200 * CREATE PORT ioctl() 1201 */ 1202 static int snd_seq_ioctl_create_port(client_t * client, void __user *arg) 1203 { 1204 client_port_t *port; 1205 snd_seq_port_info_t info; 1206 snd_seq_port_callback_t *callback; 1207 1208 if (copy_from_user(&info, arg, sizeof(info))) 1209 return -EFAULT; 1210 1211 /* it is not allowed to create the port for an another client */ 1212 if (info.addr.client != client->number) 1213 return -EPERM; 1214 1215 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1); 1216 if (port == NULL) 1217 return -ENOMEM; 1218 1219 if (client->type == USER_CLIENT && info.kernel) { 1220 snd_seq_delete_port(client, port->addr.port); 1221 return -EINVAL; 1222 } 1223 if (client->type == KERNEL_CLIENT) { 1224 if ((callback = info.kernel) != NULL) { 1225 if (callback->owner) 1226 port->owner = callback->owner; 1227 port->private_data = callback->private_data; 1228 port->private_free = callback->private_free; 1229 port->callback_all = callback->callback_all; 1230 port->event_input = callback->event_input; 1231 port->c_src.open = callback->subscribe; 1232 port->c_src.close = callback->unsubscribe; 1233 port->c_dest.open = callback->use; 1234 port->c_dest.close = callback->unuse; 1235 } 1236 } 1237 1238 info.addr = port->addr; 1239 1240 snd_seq_set_port_info(port, &info); 1241 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port); 1242 1243 if (copy_to_user(arg, &info, sizeof(info))) 1244 return -EFAULT; 1245 1246 return 0; 1247 } 1248 1249 /* 1250 * DELETE PORT ioctl() 1251 */ 1252 static int snd_seq_ioctl_delete_port(client_t * client, void __user *arg) 1253 { 1254 snd_seq_port_info_t info; 1255 int err; 1256 1257 /* set passed parameters */ 1258 if (copy_from_user(&info, arg, sizeof(info))) 1259 return -EFAULT; 1260 1261 /* it is not allowed to remove the port for an another client */ 1262 if (info.addr.client != client->number) 1263 return -EPERM; 1264 1265 err = snd_seq_delete_port(client, info.addr.port); 1266 if (err >= 0) 1267 snd_seq_system_client_ev_port_exit(client->number, info.addr.port); 1268 return err; 1269 } 1270 1271 1272 /* 1273 * GET_PORT_INFO ioctl() (on any client) 1274 */ 1275 static int snd_seq_ioctl_get_port_info(client_t *client, void __user *arg) 1276 { 1277 client_t *cptr; 1278 client_port_t *port; 1279 snd_seq_port_info_t info; 1280 1281 if (copy_from_user(&info, arg, sizeof(info))) 1282 return -EFAULT; 1283 cptr = snd_seq_client_use_ptr(info.addr.client); 1284 if (cptr == NULL) 1285 return -ENXIO; 1286 1287 port = snd_seq_port_use_ptr(cptr, info.addr.port); 1288 if (port == NULL) { 1289 snd_seq_client_unlock(cptr); 1290 return -ENOENT; /* don't change */ 1291 } 1292 1293 /* get port info */ 1294 snd_seq_get_port_info(port, &info); 1295 snd_seq_port_unlock(port); 1296 snd_seq_client_unlock(cptr); 1297 1298 if (copy_to_user(arg, &info, sizeof(info))) 1299 return -EFAULT; 1300 return 0; 1301 } 1302 1303 1304 /* 1305 * SET_PORT_INFO ioctl() (only ports on this/own client) 1306 */ 1307 static int snd_seq_ioctl_set_port_info(client_t * client, void __user *arg) 1308 { 1309 client_port_t *port; 1310 snd_seq_port_info_t info; 1311 1312 if (copy_from_user(&info, arg, sizeof(info))) 1313 return -EFAULT; 1314 1315 if (info.addr.client != client->number) /* only set our own ports ! */ 1316 return -EPERM; 1317 port = snd_seq_port_use_ptr(client, info.addr.port); 1318 if (port) { 1319 snd_seq_set_port_info(port, &info); 1320 snd_seq_port_unlock(port); 1321 } 1322 return 0; 1323 } 1324 1325 1326 /* 1327 * port subscription (connection) 1328 */ 1329 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ) 1330 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE) 1331 1332 static int check_subscription_permission(client_t *client, client_port_t *sport, 1333 client_port_t *dport, 1334 snd_seq_port_subscribe_t *subs) 1335 { 1336 if (client->number != subs->sender.client && 1337 client->number != subs->dest.client) { 1338 /* connection by third client - check export permission */ 1339 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1340 return -EPERM; 1341 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1342 return -EPERM; 1343 } 1344 1345 /* check read permission */ 1346 /* if sender or receiver is the subscribing client itself, 1347 * no permission check is necessary 1348 */ 1349 if (client->number != subs->sender.client) { 1350 if (! check_port_perm(sport, PERM_RD)) 1351 return -EPERM; 1352 } 1353 /* check write permission */ 1354 if (client->number != subs->dest.client) { 1355 if (! check_port_perm(dport, PERM_WR)) 1356 return -EPERM; 1357 } 1358 return 0; 1359 } 1360 1361 /* 1362 * send an subscription notify event to user client: 1363 * client must be user client. 1364 */ 1365 int snd_seq_client_notify_subscription(int client, int port, 1366 snd_seq_port_subscribe_t *info, int evtype) 1367 { 1368 snd_seq_event_t event; 1369 1370 memset(&event, 0, sizeof(event)); 1371 event.type = evtype; 1372 event.data.connect.dest = info->dest; 1373 event.data.connect.sender = info->sender; 1374 1375 return snd_seq_system_notify(client, port, &event); /* non-atomic */ 1376 } 1377 1378 1379 /* 1380 * add to port's subscription list IOCTL interface 1381 */ 1382 static int snd_seq_ioctl_subscribe_port(client_t * client, void __user *arg) 1383 { 1384 int result = -EINVAL; 1385 client_t *receiver = NULL, *sender = NULL; 1386 client_port_t *sport = NULL, *dport = NULL; 1387 snd_seq_port_subscribe_t subs; 1388 1389 if (copy_from_user(&subs, arg, sizeof(subs))) 1390 return -EFAULT; 1391 1392 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL) 1393 goto __end; 1394 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1395 goto __end; 1396 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1397 goto __end; 1398 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL) 1399 goto __end; 1400 1401 result = check_subscription_permission(client, sport, dport, &subs); 1402 if (result < 0) 1403 goto __end; 1404 1405 /* connect them */ 1406 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs); 1407 if (! result) /* broadcast announce */ 1408 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1409 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED); 1410 __end: 1411 if (sport) 1412 snd_seq_port_unlock(sport); 1413 if (dport) 1414 snd_seq_port_unlock(dport); 1415 if (sender) 1416 snd_seq_client_unlock(sender); 1417 if (receiver) 1418 snd_seq_client_unlock(receiver); 1419 return result; 1420 } 1421 1422 1423 /* 1424 * remove from port's subscription list 1425 */ 1426 static int snd_seq_ioctl_unsubscribe_port(client_t * client, void __user *arg) 1427 { 1428 int result = -ENXIO; 1429 client_t *receiver = NULL, *sender = NULL; 1430 client_port_t *sport = NULL, *dport = NULL; 1431 snd_seq_port_subscribe_t subs; 1432 1433 if (copy_from_user(&subs, arg, sizeof(subs))) 1434 return -EFAULT; 1435 1436 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL) 1437 goto __end; 1438 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1439 goto __end; 1440 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1441 goto __end; 1442 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL) 1443 goto __end; 1444 1445 result = check_subscription_permission(client, sport, dport, &subs); 1446 if (result < 0) 1447 goto __end; 1448 1449 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs); 1450 if (! result) /* broadcast announce */ 1451 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1452 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED); 1453 __end: 1454 if (sport) 1455 snd_seq_port_unlock(sport); 1456 if (dport) 1457 snd_seq_port_unlock(dport); 1458 if (sender) 1459 snd_seq_client_unlock(sender); 1460 if (receiver) 1461 snd_seq_client_unlock(receiver); 1462 return result; 1463 } 1464 1465 1466 /* CREATE_QUEUE ioctl() */ 1467 static int snd_seq_ioctl_create_queue(client_t *client, void __user *arg) 1468 { 1469 snd_seq_queue_info_t info; 1470 int result; 1471 queue_t *q; 1472 1473 if (copy_from_user(&info, arg, sizeof(info))) 1474 return -EFAULT; 1475 1476 result = snd_seq_queue_alloc(client->number, info.locked, info.flags); 1477 if (result < 0) 1478 return result; 1479 1480 q = queueptr(result); 1481 if (q == NULL) 1482 return -EINVAL; 1483 1484 info.queue = q->queue; 1485 info.locked = q->locked; 1486 info.owner = q->owner; 1487 1488 /* set queue name */ 1489 if (! info.name[0]) 1490 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue); 1491 strlcpy(q->name, info.name, sizeof(q->name)); 1492 queuefree(q); 1493 1494 if (copy_to_user(arg, &info, sizeof(info))) 1495 return -EFAULT; 1496 1497 return 0; 1498 } 1499 1500 /* DELETE_QUEUE ioctl() */ 1501 static int snd_seq_ioctl_delete_queue(client_t *client, void __user *arg) 1502 { 1503 snd_seq_queue_info_t info; 1504 1505 if (copy_from_user(&info, arg, sizeof(info))) 1506 return -EFAULT; 1507 1508 return snd_seq_queue_delete(client->number, info.queue); 1509 } 1510 1511 /* GET_QUEUE_INFO ioctl() */ 1512 static int snd_seq_ioctl_get_queue_info(client_t *client, void __user *arg) 1513 { 1514 snd_seq_queue_info_t info; 1515 queue_t *q; 1516 1517 if (copy_from_user(&info, arg, sizeof(info))) 1518 return -EFAULT; 1519 1520 q = queueptr(info.queue); 1521 if (q == NULL) 1522 return -EINVAL; 1523 1524 memset(&info, 0, sizeof(info)); 1525 info.queue = q->queue; 1526 info.owner = q->owner; 1527 info.locked = q->locked; 1528 strlcpy(info.name, q->name, sizeof(info.name)); 1529 queuefree(q); 1530 1531 if (copy_to_user(arg, &info, sizeof(info))) 1532 return -EFAULT; 1533 1534 return 0; 1535 } 1536 1537 /* SET_QUEUE_INFO ioctl() */ 1538 static int snd_seq_ioctl_set_queue_info(client_t *client, void __user *arg) 1539 { 1540 snd_seq_queue_info_t info; 1541 queue_t *q; 1542 1543 if (copy_from_user(&info, arg, sizeof(info))) 1544 return -EFAULT; 1545 1546 if (info.owner != client->number) 1547 return -EINVAL; 1548 1549 /* change owner/locked permission */ 1550 if (snd_seq_queue_check_access(info.queue, client->number)) { 1551 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0) 1552 return -EPERM; 1553 if (info.locked) 1554 snd_seq_queue_use(info.queue, client->number, 1); 1555 } else { 1556 return -EPERM; 1557 } 1558 1559 q = queueptr(info.queue); 1560 if (! q) 1561 return -EINVAL; 1562 if (q->owner != client->number) { 1563 queuefree(q); 1564 return -EPERM; 1565 } 1566 strlcpy(q->name, info.name, sizeof(q->name)); 1567 queuefree(q); 1568 1569 return 0; 1570 } 1571 1572 /* GET_NAMED_QUEUE ioctl() */ 1573 static int snd_seq_ioctl_get_named_queue(client_t *client, void __user *arg) 1574 { 1575 snd_seq_queue_info_t info; 1576 queue_t *q; 1577 1578 if (copy_from_user(&info, arg, sizeof(info))) 1579 return -EFAULT; 1580 1581 q = snd_seq_queue_find_name(info.name); 1582 if (q == NULL) 1583 return -EINVAL; 1584 info.queue = q->queue; 1585 info.owner = q->owner; 1586 info.locked = q->locked; 1587 queuefree(q); 1588 1589 if (copy_to_user(arg, &info, sizeof(info))) 1590 return -EFAULT; 1591 1592 return 0; 1593 } 1594 1595 /* GET_QUEUE_STATUS ioctl() */ 1596 static int snd_seq_ioctl_get_queue_status(client_t * client, void __user *arg) 1597 { 1598 snd_seq_queue_status_t status; 1599 queue_t *queue; 1600 seq_timer_t *tmr; 1601 1602 if (copy_from_user(&status, arg, sizeof(status))) 1603 return -EFAULT; 1604 1605 queue = queueptr(status.queue); 1606 if (queue == NULL) 1607 return -EINVAL; 1608 memset(&status, 0, sizeof(status)); 1609 status.queue = queue->queue; 1610 1611 tmr = queue->timer; 1612 status.events = queue->tickq->cells + queue->timeq->cells; 1613 1614 status.time = snd_seq_timer_get_cur_time(tmr); 1615 status.tick = snd_seq_timer_get_cur_tick(tmr); 1616 1617 status.running = tmr->running; 1618 1619 status.flags = queue->flags; 1620 queuefree(queue); 1621 1622 if (copy_to_user(arg, &status, sizeof(status))) 1623 return -EFAULT; 1624 return 0; 1625 } 1626 1627 1628 /* GET_QUEUE_TEMPO ioctl() */ 1629 static int snd_seq_ioctl_get_queue_tempo(client_t * client, void __user *arg) 1630 { 1631 snd_seq_queue_tempo_t tempo; 1632 queue_t *queue; 1633 seq_timer_t *tmr; 1634 1635 if (copy_from_user(&tempo, arg, sizeof(tempo))) 1636 return -EFAULT; 1637 1638 queue = queueptr(tempo.queue); 1639 if (queue == NULL) 1640 return -EINVAL; 1641 memset(&tempo, 0, sizeof(tempo)); 1642 tempo.queue = queue->queue; 1643 1644 tmr = queue->timer; 1645 1646 tempo.tempo = tmr->tempo; 1647 tempo.ppq = tmr->ppq; 1648 tempo.skew_value = tmr->skew; 1649 tempo.skew_base = tmr->skew_base; 1650 queuefree(queue); 1651 1652 if (copy_to_user(arg, &tempo, sizeof(tempo))) 1653 return -EFAULT; 1654 return 0; 1655 } 1656 1657 1658 /* SET_QUEUE_TEMPO ioctl() */ 1659 int snd_seq_set_queue_tempo(int client, snd_seq_queue_tempo_t *tempo) 1660 { 1661 if (!snd_seq_queue_check_access(tempo->queue, client)) 1662 return -EPERM; 1663 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo); 1664 } 1665 1666 static int snd_seq_ioctl_set_queue_tempo(client_t * client, void __user *arg) 1667 { 1668 int result; 1669 snd_seq_queue_tempo_t tempo; 1670 1671 if (copy_from_user(&tempo, arg, sizeof(tempo))) 1672 return -EFAULT; 1673 1674 result = snd_seq_set_queue_tempo(client->number, &tempo); 1675 return result < 0 ? result : 0; 1676 } 1677 1678 1679 /* GET_QUEUE_TIMER ioctl() */ 1680 static int snd_seq_ioctl_get_queue_timer(client_t * client, void __user *arg) 1681 { 1682 snd_seq_queue_timer_t timer; 1683 queue_t *queue; 1684 seq_timer_t *tmr; 1685 1686 if (copy_from_user(&timer, arg, sizeof(timer))) 1687 return -EFAULT; 1688 1689 queue = queueptr(timer.queue); 1690 if (queue == NULL) 1691 return -EINVAL; 1692 1693 if (down_interruptible(&queue->timer_mutex)) { 1694 queuefree(queue); 1695 return -ERESTARTSYS; 1696 } 1697 tmr = queue->timer; 1698 memset(&timer, 0, sizeof(timer)); 1699 timer.queue = queue->queue; 1700 1701 timer.type = tmr->type; 1702 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1703 timer.u.alsa.id = tmr->alsa_id; 1704 timer.u.alsa.resolution = tmr->preferred_resolution; 1705 } 1706 up(&queue->timer_mutex); 1707 queuefree(queue); 1708 1709 if (copy_to_user(arg, &timer, sizeof(timer))) 1710 return -EFAULT; 1711 return 0; 1712 } 1713 1714 1715 /* SET_QUEUE_TIMER ioctl() */ 1716 static int snd_seq_ioctl_set_queue_timer(client_t * client, void __user *arg) 1717 { 1718 int result = 0; 1719 snd_seq_queue_timer_t timer; 1720 1721 if (copy_from_user(&timer, arg, sizeof(timer))) 1722 return -EFAULT; 1723 1724 if (timer.type != SNDRV_SEQ_TIMER_ALSA) 1725 return -EINVAL; 1726 1727 if (snd_seq_queue_check_access(timer.queue, client->number)) { 1728 queue_t *q; 1729 seq_timer_t *tmr; 1730 1731 q = queueptr(timer.queue); 1732 if (q == NULL) 1733 return -ENXIO; 1734 if (down_interruptible(&q->timer_mutex)) { 1735 queuefree(q); 1736 return -ERESTARTSYS; 1737 } 1738 tmr = q->timer; 1739 snd_seq_queue_timer_close(timer.queue); 1740 tmr->type = timer.type; 1741 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1742 tmr->alsa_id = timer.u.alsa.id; 1743 tmr->preferred_resolution = timer.u.alsa.resolution; 1744 } 1745 result = snd_seq_queue_timer_open(timer.queue); 1746 up(&q->timer_mutex); 1747 queuefree(q); 1748 } else { 1749 return -EPERM; 1750 } 1751 1752 return result; 1753 } 1754 1755 1756 /* GET_QUEUE_CLIENT ioctl() */ 1757 static int snd_seq_ioctl_get_queue_client(client_t * client, void __user *arg) 1758 { 1759 snd_seq_queue_client_t info; 1760 int used; 1761 1762 if (copy_from_user(&info, arg, sizeof(info))) 1763 return -EFAULT; 1764 1765 used = snd_seq_queue_is_used(info.queue, client->number); 1766 if (used < 0) 1767 return -EINVAL; 1768 info.used = used; 1769 info.client = client->number; 1770 1771 if (copy_to_user(arg, &info, sizeof(info))) 1772 return -EFAULT; 1773 return 0; 1774 } 1775 1776 1777 /* SET_QUEUE_CLIENT ioctl() */ 1778 static int snd_seq_ioctl_set_queue_client(client_t * client, void __user *arg) 1779 { 1780 int err; 1781 snd_seq_queue_client_t info; 1782 1783 if (copy_from_user(&info, arg, sizeof(info))) 1784 return -EFAULT; 1785 1786 if (info.used >= 0) { 1787 err = snd_seq_queue_use(info.queue, client->number, info.used); 1788 if (err < 0) 1789 return err; 1790 } 1791 1792 return snd_seq_ioctl_get_queue_client(client, arg); 1793 } 1794 1795 1796 /* GET_CLIENT_POOL ioctl() */ 1797 static int snd_seq_ioctl_get_client_pool(client_t * client, void __user *arg) 1798 { 1799 snd_seq_client_pool_t info; 1800 client_t *cptr; 1801 1802 if (copy_from_user(&info, arg, sizeof(info))) 1803 return -EFAULT; 1804 1805 cptr = snd_seq_client_use_ptr(info.client); 1806 if (cptr == NULL) 1807 return -ENOENT; 1808 memset(&info, 0, sizeof(info)); 1809 info.output_pool = cptr->pool->size; 1810 info.output_room = cptr->pool->room; 1811 info.output_free = info.output_pool; 1812 if (cptr->pool) 1813 info.output_free = snd_seq_unused_cells(cptr->pool); 1814 if (cptr->type == USER_CLIENT) { 1815 info.input_pool = cptr->data.user.fifo_pool_size; 1816 info.input_free = info.input_pool; 1817 if (cptr->data.user.fifo) 1818 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool); 1819 } else { 1820 info.input_pool = 0; 1821 info.input_free = 0; 1822 } 1823 snd_seq_client_unlock(cptr); 1824 1825 if (copy_to_user(arg, &info, sizeof(info))) 1826 return -EFAULT; 1827 return 0; 1828 } 1829 1830 /* SET_CLIENT_POOL ioctl() */ 1831 static int snd_seq_ioctl_set_client_pool(client_t * client, void __user *arg) 1832 { 1833 snd_seq_client_pool_t info; 1834 int rc; 1835 1836 if (copy_from_user(&info, arg, sizeof(info))) 1837 return -EFAULT; 1838 1839 if (client->number != info.client) 1840 return -EINVAL; /* can't change other clients */ 1841 1842 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS && 1843 (! snd_seq_write_pool_allocated(client) || 1844 info.output_pool != client->pool->size)) { 1845 if (snd_seq_write_pool_allocated(client)) { 1846 /* remove all existing cells */ 1847 snd_seq_queue_client_leave_cells(client->number); 1848 snd_seq_pool_done(client->pool); 1849 } 1850 client->pool->size = info.output_pool; 1851 rc = snd_seq_pool_init(client->pool); 1852 if (rc < 0) 1853 return rc; 1854 } 1855 if (client->type == USER_CLIENT && client->data.user.fifo != NULL && 1856 info.input_pool >= 1 && 1857 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS && 1858 info.input_pool != client->data.user.fifo_pool_size) { 1859 /* change pool size */ 1860 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool); 1861 if (rc < 0) 1862 return rc; 1863 client->data.user.fifo_pool_size = info.input_pool; 1864 } 1865 if (info.output_room >= 1 && 1866 info.output_room <= client->pool->size) { 1867 client->pool->room = info.output_room; 1868 } 1869 1870 return snd_seq_ioctl_get_client_pool(client, arg); 1871 } 1872 1873 1874 /* REMOVE_EVENTS ioctl() */ 1875 static int snd_seq_ioctl_remove_events(client_t * client, void __user *arg) 1876 { 1877 snd_seq_remove_events_t info; 1878 1879 if (copy_from_user(&info, arg, sizeof(info))) 1880 return -EFAULT; 1881 1882 /* 1883 * Input mostly not implemented XXX. 1884 */ 1885 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) { 1886 /* 1887 * No restrictions so for a user client we can clear 1888 * the whole fifo 1889 */ 1890 if (client->type == USER_CLIENT) 1891 snd_seq_fifo_clear(client->data.user.fifo); 1892 } 1893 1894 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT) 1895 snd_seq_queue_remove_cells(client->number, &info); 1896 1897 return 0; 1898 } 1899 1900 1901 /* 1902 * get subscription info 1903 */ 1904 static int snd_seq_ioctl_get_subscription(client_t *client, void __user *arg) 1905 { 1906 int result; 1907 client_t *sender = NULL; 1908 client_port_t *sport = NULL; 1909 snd_seq_port_subscribe_t subs; 1910 subscribers_t *p; 1911 1912 if (copy_from_user(&subs, arg, sizeof(subs))) 1913 return -EFAULT; 1914 1915 result = -EINVAL; 1916 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1917 goto __end; 1918 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1919 goto __end; 1920 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest); 1921 if (p) { 1922 result = 0; 1923 subs = p->info; 1924 } else 1925 result = -ENOENT; 1926 1927 __end: 1928 if (sport) 1929 snd_seq_port_unlock(sport); 1930 if (sender) 1931 snd_seq_client_unlock(sender); 1932 if (result >= 0) { 1933 if (copy_to_user(arg, &subs, sizeof(subs))) 1934 return -EFAULT; 1935 } 1936 return result; 1937 } 1938 1939 1940 /* 1941 * get subscription info - check only its presence 1942 */ 1943 static int snd_seq_ioctl_query_subs(client_t *client, void __user *arg) 1944 { 1945 int result = -ENXIO; 1946 client_t *cptr = NULL; 1947 client_port_t *port = NULL; 1948 snd_seq_query_subs_t subs; 1949 port_subs_info_t *group; 1950 struct list_head *p; 1951 int i; 1952 1953 if (copy_from_user(&subs, arg, sizeof(subs))) 1954 return -EFAULT; 1955 1956 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL) 1957 goto __end; 1958 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL) 1959 goto __end; 1960 1961 switch (subs.type) { 1962 case SNDRV_SEQ_QUERY_SUBS_READ: 1963 group = &port->c_src; 1964 break; 1965 case SNDRV_SEQ_QUERY_SUBS_WRITE: 1966 group = &port->c_dest; 1967 break; 1968 default: 1969 goto __end; 1970 } 1971 1972 down_read(&group->list_mutex); 1973 /* search for the subscriber */ 1974 subs.num_subs = group->count; 1975 i = 0; 1976 result = -ENOENT; 1977 list_for_each(p, &group->list_head) { 1978 if (i++ == subs.index) { 1979 /* found! */ 1980 subscribers_t *s; 1981 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) { 1982 s = list_entry(p, subscribers_t, src_list); 1983 subs.addr = s->info.dest; 1984 } else { 1985 s = list_entry(p, subscribers_t, dest_list); 1986 subs.addr = s->info.sender; 1987 } 1988 subs.flags = s->info.flags; 1989 subs.queue = s->info.queue; 1990 result = 0; 1991 break; 1992 } 1993 } 1994 up_read(&group->list_mutex); 1995 1996 __end: 1997 if (port) 1998 snd_seq_port_unlock(port); 1999 if (cptr) 2000 snd_seq_client_unlock(cptr); 2001 if (result >= 0) { 2002 if (copy_to_user(arg, &subs, sizeof(subs))) 2003 return -EFAULT; 2004 } 2005 return result; 2006 } 2007 2008 2009 /* 2010 * query next client 2011 */ 2012 static int snd_seq_ioctl_query_next_client(client_t *client, void __user *arg) 2013 { 2014 client_t *cptr = NULL; 2015 snd_seq_client_info_t info; 2016 2017 if (copy_from_user(&info, arg, sizeof(info))) 2018 return -EFAULT; 2019 2020 /* search for next client */ 2021 info.client++; 2022 if (info.client < 0) 2023 info.client = 0; 2024 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) { 2025 cptr = snd_seq_client_use_ptr(info.client); 2026 if (cptr) 2027 break; /* found */ 2028 } 2029 if (cptr == NULL) 2030 return -ENOENT; 2031 2032 get_client_info(cptr, &info); 2033 snd_seq_client_unlock(cptr); 2034 2035 if (copy_to_user(arg, &info, sizeof(info))) 2036 return -EFAULT; 2037 return 0; 2038 } 2039 2040 /* 2041 * query next port 2042 */ 2043 static int snd_seq_ioctl_query_next_port(client_t *client, void __user *arg) 2044 { 2045 client_t *cptr; 2046 client_port_t *port = NULL; 2047 snd_seq_port_info_t info; 2048 2049 if (copy_from_user(&info, arg, sizeof(info))) 2050 return -EFAULT; 2051 cptr = snd_seq_client_use_ptr(info.addr.client); 2052 if (cptr == NULL) 2053 return -ENXIO; 2054 2055 /* search for next port */ 2056 info.addr.port++; 2057 port = snd_seq_port_query_nearest(cptr, &info); 2058 if (port == NULL) { 2059 snd_seq_client_unlock(cptr); 2060 return -ENOENT; 2061 } 2062 2063 /* get port info */ 2064 info.addr = port->addr; 2065 snd_seq_get_port_info(port, &info); 2066 snd_seq_port_unlock(port); 2067 snd_seq_client_unlock(cptr); 2068 2069 if (copy_to_user(arg, &info, sizeof(info))) 2070 return -EFAULT; 2071 return 0; 2072 } 2073 2074 /* -------------------------------------------------------- */ 2075 2076 static struct seq_ioctl_table { 2077 unsigned int cmd; 2078 int (*func)(client_t *client, void __user * arg); 2079 } ioctl_tables[] = { 2080 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info }, 2081 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode }, 2082 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info }, 2083 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info }, 2084 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port }, 2085 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port }, 2086 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info }, 2087 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info }, 2088 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port }, 2089 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port }, 2090 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue }, 2091 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue }, 2092 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info }, 2093 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info }, 2094 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue }, 2095 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status }, 2096 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo }, 2097 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo }, 2098 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer }, 2099 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer }, 2100 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client }, 2101 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client }, 2102 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool }, 2103 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool }, 2104 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription }, 2105 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client }, 2106 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port }, 2107 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events }, 2108 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs }, 2109 { 0, NULL }, 2110 }; 2111 2112 static int snd_seq_do_ioctl(client_t *client, unsigned int cmd, void __user *arg) 2113 { 2114 struct seq_ioctl_table *p; 2115 2116 switch (cmd) { 2117 case SNDRV_SEQ_IOCTL_PVERSION: 2118 /* return sequencer version number */ 2119 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0; 2120 case SNDRV_SEQ_IOCTL_CLIENT_ID: 2121 /* return the id of this client */ 2122 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0; 2123 } 2124 2125 if (! arg) 2126 return -EFAULT; 2127 for (p = ioctl_tables; p->cmd; p++) { 2128 if (p->cmd == cmd) 2129 return p->func(client, arg); 2130 } 2131 snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%2x)\n", 2132 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd)); 2133 return -ENOTTY; 2134 } 2135 2136 2137 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 2138 { 2139 client_t *client = (client_t *) file->private_data; 2140 2141 snd_assert(client != NULL, return -ENXIO); 2142 2143 return snd_seq_do_ioctl(client, cmd, (void __user *) arg); 2144 } 2145 2146 #ifdef CONFIG_COMPAT 2147 #include "seq_compat.c" 2148 #else 2149 #define snd_seq_ioctl_compat NULL 2150 #endif 2151 2152 /* -------------------------------------------------------- */ 2153 2154 2155 /* exported to kernel modules */ 2156 int snd_seq_create_kernel_client(snd_card_t *card, int client_index, snd_seq_client_callback_t * callback) 2157 { 2158 client_t *client; 2159 2160 snd_assert(! in_interrupt(), return -EBUSY); 2161 2162 if (callback == NULL) 2163 return -EINVAL; 2164 if (card && client_index > 7) 2165 return -EINVAL; 2166 if (card == NULL && client_index > 63) 2167 return -EINVAL; 2168 if (card) 2169 client_index += 64 + (card->number << 3); 2170 2171 if (down_interruptible(®ister_mutex)) 2172 return -ERESTARTSYS; 2173 /* empty write queue as default */ 2174 client = seq_create_client1(client_index, 0); 2175 if (client == NULL) { 2176 up(®ister_mutex); 2177 return -EBUSY; /* failure code */ 2178 } 2179 usage_alloc(&client_usage, 1); 2180 2181 client->accept_input = callback->allow_output; 2182 client->accept_output = callback->allow_input; 2183 2184 /* fill client data */ 2185 client->data.kernel.card = card; 2186 client->data.kernel.private_data = callback->private_data; 2187 sprintf(client->name, "Client-%d", client->number); 2188 2189 client->type = KERNEL_CLIENT; 2190 up(®ister_mutex); 2191 2192 /* make others aware this new client */ 2193 snd_seq_system_client_ev_client_start(client->number); 2194 2195 /* return client number to caller */ 2196 return client->number; 2197 } 2198 2199 /* exported to kernel modules */ 2200 int snd_seq_delete_kernel_client(int client) 2201 { 2202 client_t *ptr; 2203 2204 snd_assert(! in_interrupt(), return -EBUSY); 2205 2206 ptr = clientptr(client); 2207 if (ptr == NULL) 2208 return -EINVAL; 2209 2210 seq_free_client(ptr); 2211 kfree(ptr); 2212 return 0; 2213 } 2214 2215 2216 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue 2217 * and snd_seq_kernel_client_enqueue_blocking 2218 */ 2219 static int kernel_client_enqueue(int client, snd_seq_event_t *ev, 2220 struct file *file, int blocking, 2221 int atomic, int hop) 2222 { 2223 client_t *cptr; 2224 int result; 2225 2226 snd_assert(ev != NULL, return -EINVAL); 2227 2228 if (ev->type == SNDRV_SEQ_EVENT_NONE) 2229 return 0; /* ignore this */ 2230 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR) 2231 return -EINVAL; /* quoted events can't be enqueued */ 2232 2233 /* fill in client number */ 2234 ev->source.client = client; 2235 2236 if (check_event_type_and_length(ev)) 2237 return -EINVAL; 2238 2239 cptr = snd_seq_client_use_ptr(client); 2240 if (cptr == NULL) 2241 return -EINVAL; 2242 2243 if (! cptr->accept_output) 2244 result = -EPERM; 2245 else /* send it */ 2246 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop); 2247 2248 snd_seq_client_unlock(cptr); 2249 return result; 2250 } 2251 2252 /* 2253 * exported, called by kernel clients to enqueue events (w/o blocking) 2254 * 2255 * RETURN VALUE: zero if succeed, negative if error 2256 */ 2257 int snd_seq_kernel_client_enqueue(int client, snd_seq_event_t * ev, 2258 int atomic, int hop) 2259 { 2260 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop); 2261 } 2262 2263 /* 2264 * exported, called by kernel clients to enqueue events (with blocking) 2265 * 2266 * RETURN VALUE: zero if succeed, negative if error 2267 */ 2268 int snd_seq_kernel_client_enqueue_blocking(int client, snd_seq_event_t * ev, 2269 struct file *file, 2270 int atomic, int hop) 2271 { 2272 return kernel_client_enqueue(client, ev, file, 1, atomic, hop); 2273 } 2274 2275 2276 /* 2277 * exported, called by kernel clients to dispatch events directly to other 2278 * clients, bypassing the queues. Event time-stamp will be updated. 2279 * 2280 * RETURN VALUE: negative = delivery failed, 2281 * zero, or positive: the number of delivered events 2282 */ 2283 int snd_seq_kernel_client_dispatch(int client, snd_seq_event_t * ev, 2284 int atomic, int hop) 2285 { 2286 client_t *cptr; 2287 int result; 2288 2289 snd_assert(ev != NULL, return -EINVAL); 2290 2291 /* fill in client number */ 2292 ev->queue = SNDRV_SEQ_QUEUE_DIRECT; 2293 ev->source.client = client; 2294 2295 if (check_event_type_and_length(ev)) 2296 return -EINVAL; 2297 2298 cptr = snd_seq_client_use_ptr(client); 2299 if (cptr == NULL) 2300 return -EINVAL; 2301 2302 if (!cptr->accept_output) 2303 result = -EPERM; 2304 else 2305 result = snd_seq_deliver_event(cptr, ev, atomic, hop); 2306 2307 snd_seq_client_unlock(cptr); 2308 return result; 2309 } 2310 2311 2312 /* 2313 * exported, called by kernel clients to perform same functions as with 2314 * userland ioctl() 2315 */ 2316 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg) 2317 { 2318 client_t *client; 2319 mm_segment_t fs; 2320 int result; 2321 2322 client = clientptr(clientid); 2323 if (client == NULL) 2324 return -ENXIO; 2325 fs = snd_enter_user(); 2326 result = snd_seq_do_ioctl(client, cmd, (void __user *)arg); 2327 snd_leave_user(fs); 2328 return result; 2329 } 2330 2331 2332 /* exported (for OSS emulator) */ 2333 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait) 2334 { 2335 client_t *client; 2336 2337 client = clientptr(clientid); 2338 if (client == NULL) 2339 return -ENXIO; 2340 2341 if (! snd_seq_write_pool_allocated(client)) 2342 return 1; 2343 if (snd_seq_pool_poll_wait(client->pool, file, wait)) 2344 return 1; 2345 return 0; 2346 } 2347 2348 /*---------------------------------------------------------------------------*/ 2349 2350 /* 2351 * /proc interface 2352 */ 2353 static void snd_seq_info_dump_subscribers(snd_info_buffer_t *buffer, port_subs_info_t *group, int is_src, char *msg) 2354 { 2355 struct list_head *p; 2356 subscribers_t *s; 2357 int count = 0; 2358 2359 down_read(&group->list_mutex); 2360 if (list_empty(&group->list_head)) { 2361 up_read(&group->list_mutex); 2362 return; 2363 } 2364 snd_iprintf(buffer, msg); 2365 list_for_each(p, &group->list_head) { 2366 if (is_src) 2367 s = list_entry(p, subscribers_t, src_list); 2368 else 2369 s = list_entry(p, subscribers_t, dest_list); 2370 if (count++) 2371 snd_iprintf(buffer, ", "); 2372 snd_iprintf(buffer, "%d:%d", 2373 is_src ? s->info.dest.client : s->info.sender.client, 2374 is_src ? s->info.dest.port : s->info.sender.port); 2375 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 2376 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue); 2377 if (group->exclusive) 2378 snd_iprintf(buffer, "[ex]"); 2379 } 2380 up_read(&group->list_mutex); 2381 snd_iprintf(buffer, "\n"); 2382 } 2383 2384 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-') 2385 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-') 2386 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e') 2387 2388 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-') 2389 2390 static void snd_seq_info_dump_ports(snd_info_buffer_t *buffer, client_t *client) 2391 { 2392 struct list_head *l; 2393 2394 down(&client->ports_mutex); 2395 list_for_each(l, &client->ports_list_head) { 2396 client_port_t *p = list_entry(l, client_port_t, list); 2397 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n", 2398 p->addr.port, p->name, 2399 FLAG_PERM_RD(p->capability), 2400 FLAG_PERM_WR(p->capability), 2401 FLAG_PERM_EX(p->capability), 2402 FLAG_PERM_DUPLEX(p->capability)); 2403 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: "); 2404 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: "); 2405 } 2406 up(&client->ports_mutex); 2407 } 2408 2409 2410 /* exported to seq_info.c */ 2411 void snd_seq_info_clients_read(snd_info_entry_t *entry, 2412 snd_info_buffer_t * buffer) 2413 { 2414 extern void snd_seq_info_pool(snd_info_buffer_t * buffer, pool_t * pool, char *space); 2415 int c; 2416 client_t *client; 2417 2418 snd_iprintf(buffer, "Client info\n"); 2419 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur); 2420 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak); 2421 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS); 2422 snd_iprintf(buffer, "\n"); 2423 2424 /* list the client table */ 2425 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) { 2426 client = snd_seq_client_use_ptr(c); 2427 if (client == NULL) 2428 continue; 2429 if (client->type == NO_CLIENT) { 2430 snd_seq_client_unlock(client); 2431 continue; 2432 } 2433 2434 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n", 2435 c, client->name, 2436 client->type == USER_CLIENT ? "User" : "Kernel"); 2437 snd_seq_info_dump_ports(buffer, client); 2438 if (snd_seq_write_pool_allocated(client)) { 2439 snd_iprintf(buffer, " Output pool :\n"); 2440 snd_seq_info_pool(buffer, client->pool, " "); 2441 } 2442 if (client->type == USER_CLIENT && client->data.user.fifo && 2443 client->data.user.fifo->pool) { 2444 snd_iprintf(buffer, " Input pool :\n"); 2445 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " "); 2446 } 2447 snd_seq_client_unlock(client); 2448 } 2449 } 2450 2451 2452 /*---------------------------------------------------------------------------*/ 2453 2454 2455 /* 2456 * REGISTRATION PART 2457 */ 2458 2459 static struct file_operations snd_seq_f_ops = 2460 { 2461 .owner = THIS_MODULE, 2462 .read = snd_seq_read, 2463 .write = snd_seq_write, 2464 .open = snd_seq_open, 2465 .release = snd_seq_release, 2466 .poll = snd_seq_poll, 2467 .unlocked_ioctl = snd_seq_ioctl, 2468 .compat_ioctl = snd_seq_ioctl_compat, 2469 }; 2470 2471 static snd_minor_t snd_seq_reg = 2472 { 2473 .comment = "sequencer", 2474 .f_ops = &snd_seq_f_ops, 2475 }; 2476 2477 2478 /* 2479 * register sequencer device 2480 */ 2481 int __init snd_sequencer_device_init(void) 2482 { 2483 int err; 2484 2485 if (down_interruptible(®ister_mutex)) 2486 return -ERESTARTSYS; 2487 2488 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0, &snd_seq_reg, "seq")) < 0) { 2489 up(®ister_mutex); 2490 return err; 2491 } 2492 2493 up(®ister_mutex); 2494 2495 return 0; 2496 } 2497 2498 2499 2500 /* 2501 * unregister sequencer device 2502 */ 2503 void __exit snd_sequencer_device_done(void) 2504 { 2505 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0); 2506 } 2507